Android.Media.MediaRecorder -录制音频时的延迟，带有静默部分

MediaRecorder mediaRecorder = new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
mediaRecorder.setOutputFile(outputFilePath);
mediaRecorder.prepare();

mediaRecorder.setAudioEncodingBitRate(128000); // 设置比特率
mediaRecorder.setAudioSamplingRate(44100); // 设置采样率

AudioRecord audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,
        44100, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);

short[] buffer = new short[bufferSize];
int read;
while (isRecording) {
    read = audioRecord.read(buffer, 0, buffer.length);
    if (read > 0) {
        // 处理音频数据
    }
}